<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <style>
    body{
      height: 2000px;
      width: 2000px;
    }
    #app {
      height: 100px;
      width: 100px;
      border: 20px solid #ccc;
      padding: 10px;
      position:absolute;
      top:400px;
      left: 400px;
      background-color: aqua;
    }
  </style>
  <title>Document</title>
</head>
<body>
  <div id="app">


  </div>
  <script>

  </script>
</body>
</html>